In Biocommunications we have cubes. They are painted gray, white and black on various sides. We take pictures of them then we use photoshop to analyze the pictures. In the screenshot above, the top of the cube is painted gray, and the right and left are both painted white. I lit the cube in order to have the right side appear white and the left side appear near black. In analyzing the left side of the cube my histogram tells me that I (my camera) did an okay job at making the left side black. It looks way better when you squint at it.
We are Bios and this is what we do.